Automatically create networks and buffers specified in networks.ini

Automatically create networks and buffers specified in networks.ini

In order for a network and certain channels to be added automatically in a blank core
configuration, add the following to a [NetworkName] block in networks.ini:

Default=Yes
DefaultChannels=#channel1,#channel2,#channel3

We'll create the network(s), and on first connect, the given channels will be joined automatically.